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    vs.      
Norihiko Koshiba is tied in the series against Masaki Yokoi, 1-1.

event round table player one result player two
Grand Prix Okayama 2008270Koshiba, Norihiko (1513)Won 2-1Yokoi, Masaki (1745)
Grand Prix Shizuoka 20177780Koshiba, Norihiko (1438)Lost 0-2Yokoi, Masaki (1632)